

a[href='/vue3/']:after {
    position absolute;
    top 1.5rem;
    left 5rem;
    z-index 1;
    padding-right 0.625rem;
    font-weight bold;
    line-height 0px;
    color #fff;
    height 0px;
    border 0.9375rem solid #ee0000;
    border-right-color transparent;
    content "新";
    box-shadow 0px 0.3125rem 0.3125rem -0.3125rem #000;
}